Amido-phosphazides



United States Patent `O 3,132,128 AMlD-PHSPHAZIDES Hugo Malz, Leverkusen, Germany, assigner to Farbenfabriken Bayer Aktiengesellschaft, Leverkusen, Germany, a corporation oi Germany No Drawing. Filed Sept. 26, 1960, Ser. No.v 87,519 Claims priority, application Germany Sept. 24, 1959 12 Claims. (Cl. 26th-'140) present invention relates to and has as its objects new and useful pesticides and processes for their production. Generally the new compounds of this invention may 'be described as phosphazides of the following formula i in which R and R are organic radicals.

It is known that organic ando-compounds react with tertiary phosphines and also with phosphorous acid esters, (see Staudinger and J. Meyer, Helvetica. Chimica Acta, vol. 2, 1919, page 635; H. Staudingerand E. Hauser, Helvetica Chimica Acta, vol. 4, 1921, page 861, and M. l. Kabacnik and V. A. Geljarov, lIzvestija Akademii Nauik S.S.R. (Bulletin de lAcademie des Sciences de lU.S,.S.R.), vol. 1956, page 790).

The compounds formed by this reaction are called phosphazides by Staudinger and they are usually very easily decomposed -as they change to phospliinic imines under nitrogen development ras shown in the following formula scheme:

Only in very few cases and with the use of tertiary phosphines some phosphazides were obtained successfully as yet. Therefore, only few phosphazides have been known :as yet land they were lonly stable 'at room temperature and only for a short while. Usually only their decomposition products, the imines which contain less nitrogen .could In this formula las said above R land R' stand yfor any organic radical, more specifically =R stands for alkyl radicals, especially lower alkyl radicals, up to 4 carbon atoms. The group Y `also may form a ring system of the piperidine, piperanne, morpholine, .thiarnorpholine, pyrrolidine series and the like. R stands tor the radical of [an organic azide, espe- ,cially of the aromatic series or of ,an aromatic carboxylic acid.v As examples there may be mentioned for the group ,R phenyl, o-,. m, p-chlorophenyl, o-, 111-, p-Xylyl, lower difalkyl 'amino phenyl, nitrophenyl, naphthyl and naphthyl radicals substituted as said above, benzoyl, halobenzoyl,

,nitrobenzoyl lower alkylbenzoyl, otor -naphthoyl.

The inventive amidophosphlazides are usually slightly colored crystalline or oily compounds which are not deimines are formed.

3,132,128 Patented May 5., 1964 composed at room temperature even lior many weeks. The crystalline'compounds may be heated up to their melting point without decomposition. But at higher temperatures above the melting point there occurs decomposi-v tion underA nitrogen development and the corresponding The strongly exotherrnic reaction between organic azides and phosphoric acid triamides can be controlled by using inert diluents. Thereby it not necessary to dissolve the phosphoric acid triamides .these diluents, Ias phosphoric acid triamides also react in the ltorni of suspensions with the azides in the solutions.

'Iihe new compounds of the present invention lvery effectively kill insects like ies, mites, aphids, etc. They distinguish themselves especially by a good contact inseoticidal activity and .at the same time by an activity on eating insects such `as caterpillars. The compounds may be used in the same manner las other known phosphoric acid insecticides, i.e. in a concentration 4from about 0.0000l% to about 1%, diluted or extended with suit# able solid or liquid carriers or diluents. Examples of such solid carriers vthere may be mentioned talc, chalk, bentonite, clay and the like, as liquid carriers there may y be mentioned water (if necessary with commercial emulsiers), alcohols, especially lower alcohols such as methanol or ethanol, ketones, especially lower ketones such as acetone or methyl ethyl ketone, liquid hydrocarbons and the like. The new compounds may further-more be used in combination with each other or with known insecticides, tentilizers etc. Y

As examples for the special utility of the present invention the compounds of the Afollowing formulae have been tested against spider mitesV and caterpillars. Aqueous dilutions of these compounds have been pre pared by mixing the yactive ingredient` with the same amount of dimethyl ionmamide as :an auxiliary solvent adding thereatter 20% by weight referred to active ingredient of 1a commercial emulsiiier consisting `of a benzyl hydroxy polyglycol ether containing about l0 to 15 glycol residues, and diluting 'at last this premixture with water to the desired concentration indicated in the following paragraphs. The tests have been oarnied out as follows:

(a) Against spider mites (contact-insecticidal action): Bean plants (Phaseolus vulgaris) of about 15 inches height are sprayed drip wet with solutions prepared as indicated above. The bean plants have been infested heavily with :the .two-spotted spider (species Tctranychus telarius).V Evaluation has been carried out atter 24 hours, 48 hours land 8 days. The following have been (b) Against caterpillars: White cabbage has Vbeen sprayed drip wet with aqueous emulsions as prepared above in the concentration as indicated below. Caterpillars (of the type diamond back moth, l0 each) have been placed on the sprayed leaves of the white cabbage. The living status has been determined after 24 hours and The following examples are given for the purpose of illustrating the present invention, without, however, limiting it in any way thereto:

l Example 1 A solution of 11.9 grams of phenyl-azide in 50 ml. of ether is added dropwise while stirring to a'solution of 33.1 grams of tris-(n-dipropyl)-phosphoric acid amide. The temperature of the reaction-mixture isv 30 C. by external cooling with ice-Water. Stirring is continued for minutes and the diluent is distilled olic from the mixture. A slightly brown oil is obtained which solidifes after a short while. Byrecrystallizing the raw crystalline material from benzine there are obtained lemonyellow crystals of a melting point of about 55 C. The yield is approximately 43 grams.

Clt-,HzsNeP-Calculated: P, 6.97%; N, 18.9% Found:

v P, 7.0%; N, 18.5%.

Aphids and spider mites are killed completely with 0.1% solutions.

By the sameway there may be obtained the compounds of the following formulae: K

Example 2 A solution of 11.9 gramsv of phenyl-azide in 50 ml. of

ether `is added dropwise while stirring to a suspension of 28.9 grams of phosphoric acid trimorpholide in 150 ml. of ether. The temperature of the mixture is kept below +30 C. by external cooling with ice-water. VThe colorless crystals of the phosphoric acid triamide change to a line golden-yellow precipitation during the reaction. After stirring the mixture for a short while the precipitation is liltered with suction. Lemon-yellow crystals are obtained which rnelt at 129 C. under decomposition. After recrystallizing the crystals from a mixture of benzene and benzine the melting point is 145A C. Yield about 39 grams.

By the same way there may be obtained the compound Vof the following formula:

Example .3

[(oiHaZNlEPNfNd-Q 22.95%; P, 8.47%. Found: N', 23.11%; P, 8.7%.

kept belowv 4 By the same way there may be obtained the compound of the following formula:

To a suspensionof 9 grams of dimorpholido-phosphoric acid-piperidide in 100 ml. of ether there is added dropwise a solution of 4 grams of phenyl-azide in 25 ml. of ether. At a moderate exothermic reaction the colorless phosphoric acid triamide changes to a line yellow precipitation, which is sucked on" after stirring for about 10 minutes. After the precipitation has been washed with ether it is pressed on clay. Golden-yellow crystals are obtained which melt at 129 C. under nitrogen development (decomposition). Yield about 12 grams.

Example 5 l ucaHmNiiE =N-N=NC By reacting equimolecular quantities of benZoyl-azide with tris-(n-dipropyD-phosphoric acid triarnide in ether there is formed a solution of a red-brown color when slightly heating the mixture. After the ether has been distilled oil from the solution there remains a clear, orange-red, viscous oil which solidies after a short time. Thecrystalline mixture is pressed on clay and crystals are obtained, which show the following analytical data:

C16Hv26ON6P-Calculatedz N, 17.6%; P, 6.4%. Found: N, 17.33%; P, 6.6%. Yield about 95% of the'theoretical.

Spider mites are killed completely with 0.1% solutions, aphids are killed completely with 0.1% solutions.

By the same way there may be obtained the compounds of thefollowing formulae:

CH3 s Example 6 fx. Emana@ a il) To a mixture of 14.7 grams of benzoylazide in 150 ml. of ether there is added while cooling externally with water a solution of 28.9 grams of phosphoric acid trirnorpholide in.150 ml. of benzene. After' stirring, golden-yellow crys- 70 tals separate from the orange-redsolution which are sucked olf, washed with ether `and dried on clay. Melting point 86-S7 C. under decomposition. Yield about `40 grams. Y, Y

Spider mites ar killed completely with 0.01% solutions.

Example 7 As described in Example 2 there is obtained a phosphazide consisting of yellow crystals, by reacting equimolecular quantities of p-nitrophenyl-azide with phosphoric acid trimorpholide in ether or benzene which melts after washing it with ether and drying it on clay at 145-,-

147" C. under decomposition. Yield about 95% of the theoretical. Y

By the same way there may be obtained the compound of the following formula:

Spider mites and caterpillars 0.01% solutions.

, Example 8 18.8 grams of 3.4-dichloro-phenyl-azide dissolved in 100 ml. of ether are added dropwise to a solution of 24.7 grams of tris-n-(diethyl)-phosphoric acid triamide in 100 ml. of ether. The temperature of the etherl solution rises to about 30 C. and becomes of an orange-red color. After about minutes the solution is filtered and the solvent is distilled off. A brown viscous oil is obtained which does not crystallize even after standing for a long time. Yield about 41 grams. Spidermites are killed completely with 0.01% solutions. Caterpillars are killed to` 90% with 0.1% solutions.

By the same way there may be obtained the compound of the following formula:

Spider mites are killed completely with 0.01% solutions. Aphids and caterpillars are killed completely with 0.1% solutions.

Example 9 To a solution of 287.9 grams of phosphoric acid triy morpholide in 100 ml. of benzene there ,isi added drop- Wise a solution of 16.9 grams'of -naphthyl-azide in 100 ml. of benzene. The benzene solution takes an orangered.` color while the temperature of the mixture rises` to about 35 C. Stirring is continued for 15 minutes andV the benzene is distilled olf from the solution in vacuo. As

a residue there is obtained a dark-brown viscous oil which crystallizes when it is rubbed with ether. When pressing n the crystallineV mixture on clay, the remaining light-brown are Ykilled completely withl e in which each R individually stands for a lower alkyl radical having up to 4 carbon atoms and when both Rs aretaken together with the geminal nitrogen,

stands for a member selected from the group consisting of piperidine, piperazine, morpholine, thiamorpholine, and pyrrolicline, and wherein R' stands for a member selected from the group consisting of phenyl, lower alkylsubstituted phenyl, chloro-substituted phenyl, nitro-substituted phenyl, lower dialkyl amino-substituted phenyl and lower alkoxy-substituted phenyl, naphthyl, benzoyl,

chloro-substituted benzoyl,V lower alkyl-substituted benzoyl, and nitro-substituted benzoyl. v 2. A compound of claim 1 wherein each R stands for `an alkyl radical having up to 4 carbon atoms and R 7. The compound of the following formula 8. The compound of the following formula 9. The compound of the following formula 10. The compound of the following formula 11 The compound of the following formula y 12. The compound of the following formula References Cited in the file of this patent Kosolapoff: Organosphosphorus Compounds (1950), page 31'8.A 

1. AN AMIDO-PHOSPHAZIDE OF THE FOLLOWING FORMULA 